<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <span>电商管理后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
    <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px':'200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏区域 -->
        <el-menu background-color="#333744" :collapse="isCollapse"
         text-color="#fff" active-text-color="#409bff" unique-opened
         :collapse-transition="false" router :default-active="activePath">
          <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>

              <!-- 二级菜单 -->
              <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children"
               :key="subItem.id" @click="saveNavState('/' + subItem.path)">
                <!-- 二级菜单的模板区域 -->
                <template slot="title">
                  <!-- 图标 -->
                  <i class="el-icon-menu"></i>
                  <!-- 文本 -->
                  <span>{{subItem.authName}}</span>
                </template>
              </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
    <!-- 右侧内容主体 -->
      <el-main>
        <!-- 路由站位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data(){
    return{
      //左侧菜单数据
      menulist:[],
      iconsObj:{
        '125':'iconfont icon-yonghuguanli',
        '103':'iconfont icon-quanxianguanli',
        '101':'iconfont icon-shangpinguanli',
        '102':'iconfont icon-dingdanguanli',
        '145':'iconfont icon-shujutongji'
      },
      //是否折叠
      isCollapse:false,
      //被激活的链接地址
      activePath:''
    }
  },
  created(){
    this.getMenuList(),
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods:{
    logout(){
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    //获取所有的菜单
    async getMenuList(){
      const {data:res} = await this.$http.get('menus')
      if(res.meta.status !==200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
      console.log(res)
    },
    //点击按钮，切换菜单的折叠与展开
    toggleCollapse(){
      this.isCollapse = !this.isCollapse
    },
    //保存链接的激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath),
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
  .home-container{
    height: 100%;
  }

  .el-header{
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div{
      display: flex;
      align-items: center;
      span{
        margin-left: 15px;
      }
    }
  }

  .el-aside{
    background-color: #333744;
    .el-menu{
      border-right: none;
    }
  }

  .el-main{
    background-color: #eaedf1;
  }

  .iconfont{
    margin-right: 10px; 
  }

  .toggle-button{
    background-color: #4a5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
</style>